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Consolidates market and data analysis skills; adds chart viz (#36)
Unifies market analysis, data analysis, and consulting reporting into a comprehensive consulting-analysis skill, enabling a two-phase workflow from analysis framework design to professional report generation. Introduces a DuckDB-based data analysis utility for Excel/CSV files and a chart-visualization skill with a flexible JS interface and extensive chart type documentation. Removes the legacy market analysis skill to streamline report generation and improve extensibility for consulting and data-driven workflows.
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# generate_line_chart — 折线图
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## 功能概述
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展示时间或连续自变量的趋势,可支持多系列对比,适合 KPI 监控、指标预测、走势分析。
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## 输入字段
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### 必填
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- `data`: array<object>,每条包含 `time`(string)与 `value`(number),多系列时附带 `group`(string)。
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### 可选
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- `style.lineWidth`: number,自定义折线线宽。
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- `style.backgroundColor`: string,设置背景色。
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- `style.palette`: string[],指定系列颜色。
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- `style.texture`: string,默认 `default`,可选 `default`/`rough`。
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- `theme`: string,默认 `default`,可选 `default`/`academy`/`dark`。
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- `width`: number,默认 `600`。
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- `height`: number,默认 `400`。
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- `title`: string,默认空字符串。
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- `axisXTitle`: string,默认空字符串。
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- `axisYTitle`: string,默认空字符串。
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## 使用建议
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所有系列的时间点应对齐;建议按 ISO 如 `2025-01-01` 或 `2025-W01` 格式化;对于高频数据可先聚合到日/周粒度避免过密。
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## 返回结果
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- 返回折线图 URL,并附 `_meta.spec` 供后续编辑。
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